/*
- Copyright (C) 2001 Steve Harris & Paul Davis
+ Copyright (C) 2001 Steve Harris & Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id$
*/
#ifndef __ardour_logcurve_h__
#define __ardour_logcurve_h__
-#include <pbd/fastlog.h>
-#include <glibmm/thread.h>
+#include "pbd/fastlog.h"
+#include <glibmm/threads.h>
namespace ARDOUR {
-class LogCurve {
+class LIBARDOUR_API LogCurve {
public:
LogCurve (float steepness = 0.2, uint32_t len = 0) {
l = len;
bool operator!= (const LogCurve& other) const {
return S != other.S || l != other.l;
}
-
+
float value (float frac) const {
return (fast_log(frac + S) - a) * b;
- }
-
+ }
+
float value (uint32_t pos) const {
return (fast_log(((float) pos/l) + S) - a) * b;
- }
+ }
float invert_value (float frac) const {
return (a - fast_log(frac + S)) * b;
- }
-
+ }
+
float invert_value (uint32_t pos) const {
return (a - fast_log(((float) pos/l) + S)) * b;
- }
+ }
void fill (float *vec, uint32_t veclen, bool invert) const {
float dx = 1.0f/veclen;
float steepness() const { return S; }
uint32_t length() const { return l; }
-
- void set_steepness (float steepness) {
- S = steepness;
- a = log(S);
+
+ void set_steepness (float steepness) {
+ S = steepness;
+ a = log(S);
b = 1.0f / log(1.0f + (1.0f / S));
}
void set_length (uint32_t len) { l = len; }
- mutable Glib::Mutex lock;
+ mutable Glib::Threads::Mutex lock;
protected:
float a;
uint32_t l;
};
-class LogCurveIn : public LogCurve
+class LIBARDOUR_API LogCurveIn : public LogCurve
{
public:
- LogCurveIn (float steepness = 0.2, uint32_t len = 0)
+ LogCurveIn (float steepness = 0.2, uint32_t len = 0)
: LogCurve (steepness, len) {}
float value (float frac) const {
return (fast_log(frac + S) - a) * b;
- }
-
+ }
+
float value (uint32_t pos) const {
return (fast_log(((float) pos/l) + S) - a) * b;
- }
+ }
};
-class LogCurveOut : public LogCurve
+class LIBARDOUR_API LogCurveOut : public LogCurve
{
public:
- LogCurveOut (float steepness = 0.2, uint32_t len = 0)
+ LogCurveOut (float steepness = 0.2, uint32_t len = 0)
: LogCurve (steepness, len) {}
};
-}; /* namespace ARDOUR */
+} // namespace ARDOUR
#endif /* __ardour_logcurve_h__ */